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Lua procedural language for PostgreSQL

PL/Lua is an implementation of Lua as a loadable procedural language for
PostgreSQL: with PL/Lua you can use PostgreSQL functions and triggers
written in the Lua programming language.

It brings the power and simplicity of Lua to PostgreSQL, including:
small memory footprint, simple syntax, lexical scoping, functions as
first-class values, and coroutines for non-preemptive threading.